Pyrolysed pitch-polysilane blends for use as anode materials in lithium ion batteries

✍ Scribed by Weibing Xing; A.M. Wilson; G. Zank; J.R. Dahn

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 543 KB
• Volume: 93
• Category: Article
• ISSN: 0167-2738
• DOI: 10.1016/s0167-2738(96)00512-7

✦ Synopsis

Blends of pitch and silane polymers, (Me,Si),(PhMeSi),, with various pitch/polymer ratios were pyrolysed at 1000°C. Some of the pyrolysed mixtures demonstrated large reversible capacities for lithium insertion (over 600 mAh/g), small irreversible capacities (150-200 mAh/g) and small hysteresis between charge and discharge cycles. The reversible capacity increases approximately linearly with increased silicon content up to about 30% Si by weight. X-ray diffraction measurements for these materials show patterns similar to those of disordered carbons, suggesting a nanodispersion of silicon atoms in pitch-based carbons. Pyrolysed pitch-polysilane blends are good alternatives to carbons for anode materials in lithium ion batteries.